You have mold and /or mildew growth in your evaporator drain pan assy. You need to take the case off and insert a mold/mildew anti growth agent. You can purchuse this at most hardware stores or HVAV supply houses.

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Smell is more than likely from standing water in the blower housing. In front of the pssenger under the hood, there is a box mounted on the firewall. That is the bloer housing. Under that housing is a drain that commonly plugs up from slime. Locate it and it should come off by squeezing it. You will see how it goes back in once you have it out.Clean the drain and woirk it to break its form. They have a tendancy to harden and stay closed. It should be soft enough to open by the fan pressure in the housing. Clean with your pinky as best you can in the box.

all the parts places i called said i wouldnt be able to get an accurate measure of the belt and suggested i get a airconditioner bypass pulley system that takes the place of the airconditioner pulley so i went and bought one and i will be putting it on today